Python 3 compatibility. (#121)

* Make common module Python 3 compatible.

* Make plasma module Python 3 compatible.

* Make photon module Python 3 compatible.

* Make numbuf module Python 3 compatible.

* Remaining changes for Python 3 compatibility.

* Test Python 3 in Travis.

* Fixes.

src/plasma/setup.py

@@ -0,0 +1,32 @@
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+from setuptools import setup, find_packages
+import setuptools.command.install as _install
+
+import subprocess
+
+class install(_install.install):
+  def run(self):
+    subprocess.check_call(["make"])
+    subprocess.check_call(["cp", "build/plasma_store", "plasma/plasma_store"])
+    subprocess.check_call(["cp", "build/plasma_manager", "plasma/plasma_manager"])
+    subprocess.check_call(["cmake", ".."], cwd="./build")
+    subprocess.check_call(["make", "install"], cwd="./build")
+    # Calling _install.install.run(self) does not fetch required packages and
+    # instead performs an old-style install. See command/install.py in
+    # setuptools. So, calling do_egg_install() manually here.
+    self.do_egg_install()
+
+setup(name="Plasma",
+      version="0.0.1",
+      description="Plasma client for Python",
+      packages=find_packages(),
+      package_data={"plasma": ["plasma_store",
+                               "plasma_manager",
+                               "libplasma.so"],
+      },
+      cmdclass={"install": install},
+      include_package_data=True,
+      zip_safe=False)